Opportunity knocks! Rare opportunity to build on a generous 0.57-acre ( 24,950 sq ft) estate-sized lot currently in Boulder County contiguous to Boulder City Limits and adjacent to the highly desirable Four Mile Creek community - with no HOA fees or covenants. The park-like setting puts you steps from Boulder's renowned bike path system, with easy car-free access to nearby schools, downtown Boulder, and beyond. A neighborhood park is just around the corner, and the surrounding community is known for being exceptionally tight-knit. Both a single custom home and a potential two-lot subdivision are possible, with annexation to the City of Boulder as the pathway forward. Pre-annexation report guidelines are available to review. Two water and sewer taps are already in place on Kingstown Pl, along with permission for two curb cuts - a significant head start on development. The flat parcel is not located in a flood zone, keeping the process straightforward. The large estate homes along the drive from Jay Rd speak to the upward value trajectory in this area, and prices in Four Mile Creek continue to appreciate. Whether you're looking to build a custom residence or explore a development opportunity, this is a rare find at this size and location. Schedule a showing to walk the property.